Infrared ray gas burner

ABSTRACT

An infrared ray gas burner comprises an ignition valve, a nozzle, an ejector, a furnace chamber, a porous combustion radiant panel and an ignition needle. An ignition nozzle is placed in the furnace chamber, a sundries baffle is provided in the furnace chamber below the porous combustion radiant panel and above the ignition nozzle and the ignition needle is set above the porous combustion radiant panel, so the gas for ignition ejected from the ignition nozzle quickly mixes with the air inside the furnace chamber, and the gas-air mixture escapes from fire holes of the porous combustion radiant panel above the ignition nozzle. The gas concentration of the mixed gas is relatively high and suitable for igniting, the main burner can be quickly ignited, there is no black smoke, obviously incomplete combustion, and it brings a high ignition rate.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a U.S. National Stage entry under 35 U.S.C.§371 of International Application No. PCT/CN2012/082852, filed on 12Oct. 2012, which claims benefit of Chinese Application No.201210110806.7, filed on 13 Apr. 2012, which is hereby incorporated byreference in its entirety.

FIELD OF THE INVENTION

The present invention relates generally to a gas burner, andparticularly to an improvement on the ignition system of a householdinfrared ray gas burner.

BACKGROUND OF THE INVENTION

With the improvement of people's living standards, gas utensils, such ashome gas cooker, warmer and barbecue oven, have spread to millions ofhouseholds; wherein, the infrared ray gas burner has been accepted bydomestic customer, commercial user and industrial user, because it hasobvious high performances on energy efficiency and environmentalprotection, cleanliness of health and safe and reliable. Since a largerrelatively large primary air coefficient has been adopted by theinfrared ray gas burner, and the burner will be normally ignited andcombusted only after the air in the furnace chamber of the burner, whichchamber is used for mixing burner gas with primary air and is fairlylarge, has been emptied, therefore, it is difficult to directly ignitethe gas-air mixture escaping from a fire hole by pulse electricalsparkle or piezoelectric ceramic ignition, both of which are easy toproduce deflagration when ignition, and generally the ignition isachieved by igniting the main burner via a start-up burner through anignition nozzle. Meanwhile, for domestic infrared ray gas cooker, andspecifically for built-in type cooker, considering the beauty of thecooker surface and sealing requirement, the ignition burner is installedoutside the infrared main burner, such as the center, bottom andexternal of the burner outside burner, with adopting a certain elevationupward. Gas flows into the ignition support through the ignition nozzleand mixes with partial air, electric ignition sparkle ignite the mixedgas on the ignition support to form an ignition flame, and the ignitionflame is fired into the main burner, so as to ignite the main burner. Atpresent, the burners in the market have the following defects onignition structure and operating mode:

1. In the way of igniting the burner from the outside of the burner byigniting on the external perimeter of the burner, its structural designmust keep a certain gap between the burner and the disc or the cookersurface, otherwise, the main burner ignited by an ignition flame will beaffected, but this structure obviously affects the appearance of theproduct, and makes the product be no vitality and no market value. Inaddition, the ignition flame is large, so the decorative sheet or thecooker surface around the burner will be blackened that obviouslyaffects the appearance of the product, and at the same time, there ismuch incomplete combustion therein.

2. In the way of igniting the burner from outside flame by an ignitionnozzle placed at the bottom of the burner, it needs a center channel toignite the main burner. In the moment of igniting the start-up burner,flareback is likely to happen after the flame spurts and touches theignition plate, which will burn in front of the start-up burner, and thetransmission distance of the flame is not enough to reach the main firehole or main fire plate, therefore resulting in misfire or deflagration.

3. In the way of igniting the burner from outside flame by an ignitionnozzle placed at the bottom of the burner, it needs a center channel toignite the main burner. Due to the limited diameter of the centerchannel, it has a certain obstruction against the transmission of theflame. When the piping gas pressure is low, the ignition flame cannotovercome the resistance to reach the main fire hole, resulting inmisfire. When the piping gas pressure is high, the air in the centerchannel is quickly removing by the smoke generated by the ignitionflame, and then the transmission of the flam is limited due to lack ofoxygen in the channel.

4. In the way of igniting the burner from outside flame by an ignitionnozzle placed at the bottom of the burner, it needs a center channel toignite the main burner. Because the ignition center channel is small,the ignition flame is generally large and black and has obviouslyincomplete combustion, and the gas-air mixture of the main burner lagsto reach the main ignition fire hole with low concentration; whenignition is not successfully achieved in the ignition moment, theignition flame will be directed to the bottom of the burner, and due tothe inertia of the flame, the ignition flame cannot stay on the surfaceor side face of the main ignition fire hole, and therefore cannotnormally ignite the burner.

5. In the way of igniting the burner from outside flame by an ignitionnozzle placed at the bottom of the burner, the structures of theignition nozzle and the ignition support are more complex, so they arenot easy to be installed at the bottom of the burner or in the narrowspace of the center channel, and the reliability and precision of theinstallation are low, and therefore result in poor ignition performanceof the product.

6. In the way of direct ignition through an ignition flame on the uppersurface of the infrared ray combustion radiant panel, since the chambervolume of the infrared ray burner is large, it needs a long time for thegas-air mixture to extrude the original air in the chamber, and theconcentration of the gas is low, so it is difficult to ignite and causesa low fire rate, especially when igniting by piezoelectric ceramics itis very difficult to achieve normal ignition.

Therefore, how to design and change the structure of the burner so as toimprove the appearance and ignition reliability of the product becomes atough technique problem in the product design of infrared ray gas burnerfor domestic and commercial use, especially in the design of built-intype infrared ray cooker at present.

SUMMARY OF THE INVENTION

The object of the invention is to improve the ignition structure of aburner and provide a new ignition integrated structure of infrared rayburner, so that the product will have beautiful appearance, highignition reliability of burner, good combustion performance, simple andcredible structure, and will be easy to install and adapted to a widerange of gas.

The technical solution of the present invention is as follows:

An infrared ray gas burner comprises an ignition valve 1, a nozzle 2, anejector 3, a furnace chamber 4, a porous combustion radiant panel 5 andan ignition needle 6, an ignition nozzle 7 passes through the furnacechamber 4 and is settled in the chamber body of the furnace chamber 4and below the porous combustion radiant panel 5, a sundries baffle 8 isprovided in the furnace chamber 4 below the porous combustion radiantpanel 5 and above the ignition nozzle 7, the ignition needle 6 is setabove the porous combustion radiant panel 5 which is set above theignition nozzle 7, the needle apex of the ignition needle 6 is placed 1mm to 10 mm above the porous combustion radiant panel 5; the ignitionneedle 6 and the housing of the furnace chamber 4 can form an ignitioncircuit, wherein the housing of the furnace chamber 4 serves as anignition negative pole, or alternatively an independent ignitionnegative pole 9 can be added; when the burner is a double ring burner,the ignition needle 6 and the sundries baffle 8 can be placed in theinner ring of the double ring burner, and they also can be placed in theouter ring of the double ring burner; the porous combustion radiantpanel 5 can be porous ceramic radiant panel, metal mesh combustionradiant panel, metal fiber combustion radiant panel, metal honeycombbody combustion radiant panel, foam metal combustion radiant panel, wiremesh combustion radiant panel or metal hole combustion radiant panel;the ignition needle 6 meanwhile can be used as a flame ionization probeof a accidental flameout protection device. Therefore, when ignite thegas burner, open the ignition valve 1, and the ignition needle 6generates an ignition spark above the porous combustion radiant panel 5if the ignition nozzle 7 and the nozzle 2 both supply gas. Because theignition nozzle 7 is placed in the furnace chamber 4, the gas forignition ejected from the ignition nozzle 7 quickly mixes with the airinside the furnace chamber 4, the gas-air mixture escapes from fireholes of the porous combustion radiant panel 5 above the ignition nozzle7, and the gas concentration is relatively high and suitable forigniting, the main burner can be quickly ignited. Due to the suitabledispersity and concentration of the ignition flame, there is noobviously incomplete combustion, no black smoke, and it brings a highignition rate. The situation that the ignition nozzle 7 is blockedcaused by sundries, such as fluids, filtering through the porouscombustion radiant panel 5 during normal use, can be avoided by placingthe sundries baffle 8 above the ignition nozzle 7 and below the porouscombustion radiant panel 5. When the ignition needle 6 is used both as aflame ionization probe of an accidental flameout protection device andas an ignition needle for ignition flame, the circuit of the pulsecontroller can be designed such that the ignition needle 6 emitsignition sparks at the beginning of the ignition, and after the burneris ignited, the ignition needle 6 immediately becomes a probe fordetecting the combustion flame signal of the burner.

The present invention can be used for domestic gas appliances, gaswarmer, gas barbecue oven, gas drying plant, and so on, and thestructures of the porous combustion radiant panel 5 and the furnacechamber 4 can be rounded, square, rectangle or other shapes; for thestructure of the double ring burner, it can be inner and outer ringstructure, or be left and right separated ring structure. For the burnerwith elongate structure, it can have two or more sets of ignitionstructures, each consisting of a ignition nozzle 7, a sundries baffle 8and a ignition needle 6, and the two or more sets of ignitionstructures, as a whole, serve as the ignition system of the wholeburner, so that the burner can be quickly ignited, and the flame canquickly spread to the whole ignition surface.

The present invention has the advantages of good performance inignition, high reliability, good combustion performance, simple andcredible structure, easy for installation and wide adaptation for gas.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention may be best understood by reference to the followingdescription taken in conjunction with the accompanying drawings.

FIG. 1 shows a front section view of an embodiment of the presentinvention.

FIG. 2 shows a top view of the structure of an independent ignitionnegative pole 9 according to an embodiment of the present invention.

FIG. 3 shows a top view of the structure of using the body of a furnacechamber 4 as the ignition negative pole according to an embodiment ofthe present invention.

FIG. 4 shows a partial enlarged view of the structure of an ignitionnozzle 7 according to an embodiment of the present invention.

FIG. 5 shows a front section view of the structure wherein the burner isa double ring burner and the ignition nozzle 7 is placed in the innerring according to an embodiment of the present invention.

FIG. 6 shows a front section view of the structure wherein the burner isa double ring burner and the ignition nozzle 7 is placed in the outerring according to an embodiment of the present invention.

FIG. 7 shows a partial enlarged top view of the structure wherein theburner is a double ring burner and the ignition nozzle 7 is placed inthe outer ring according to an embodiment of the present invention.

FIG. 8 shows a top view of the structure wherein the burner is a doublering burner and the ignition nozzle 7 placed in the inner ring has anindependent ignition negative pole 9 according to an embodiment of thepresent invention.

FIG. 9 shows a top view of the structure wherein the burner is a doublering burner and the ignition nozzle 7 placed in the outer ring has anindependent ignition negative pole 9 according to an embodiment of thepresent invention.

FIG. 10 shows a top view of the structure wherein the surface of theburner is in combined shape with two sets of ignition structures, eachconsisting of a ignition nozzle 7, a sundries baffle 8 and a ignitionneedle 6, according to an embodiment of the present invention.

FIG. 11 shows a top view of the structure wherein the surface of theburner has a combined shape with only one set of ignition structuresconsisting of a ignition nozzle 7, a sundries baffle 8 and a ignitionneedle 6 according to an embodiment of the present invention.

FIG. 12 shows a top view of the structure wherein the surface of theburner has a rectangular shape according to an embodiment of the presentinvention.

FIG. 13 shows a top view of the structure wherein the surface of theburner has a square shape according to an embodiment of the presentinvention.

FIG. 14 shows a top view of the structure wherein the surface of theburner has a trapezoid shape according to an embodiment of the presentinvention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Example 1 (FIGS. 1, 2and 4)

An infrared ray gas burner for domestic use, comprises an ignition valve1, a nozzle 2, an ejector 3, a furnace chamber 4, a porous combustionradiant panel 5 and an ignition needle 6, an ignition nozzle 7 passesthrough the furnace chamber 4 and is settled in the chamber body of thefurnace chamber 4 and below the porous combustion radiant panel 5, asundries baffle 8 is provided in the furnace chamber 4 below the porouscombustion radiant panel 5 and above the ignition nozzle 7, the ignitionneedle 6 is set above the porous combustion radiant panel 5 which is setabove the ignition nozzle 7, the needle apex of the ignition needle 6 isplaced 3 mm above the porous combustion radiant panel 5, and the burneris provided with an independent ignition negative pole 9, which,together with the ignition needle 6, forms a ignition circuit; theburner is a simple ring burner; the porous combustion radiant panel 5 isa porous ceramic radiant panel. Therefore, when ignite the gas burner,the ignition valve 1 is opened, and the ignition needle 6 generates anignition spark above the porous combustion radiant panel 5 if theignition nozzle 7 and the nozzle 2 both supply gas. Since the ignitionnozzle 7 is placed in the furnace chamber 4, the gas for ignitionejected from the ignition nozzle 7 quickly mixes with the air inside thefurnace chamber 4, the gas-air mixture escapes from fire holes of theporous combustion radiant panel 5 above the ignition nozzle 7, and thegas concentration is relatively high and suitable for igniting, the mainburner can be quickly ignited. Due to the suitable dispersity andconcentration of the ignition flame, there is no obviously incompletecombustion, no black smoke, and it brings a high ignition rate. Thesituation that the ignition nozzle 7 is blocked caused by sundries, suchas fluids, filtering through the porous combustion radiant panel 5during normal use, can be avoided by placing the sundries baffle 8 abovethe ignition nozzle 7 and below the porous combustion radiant panel 5.The present invention has the advantages of good performance inignition, high reliability, simple and credible structure, easy forinstallation and wide adaptation for gas.

Example 2 (FIGS. 1, 3 and 4)

It is substantially the same as Example 1, differing only in that theignition negative pole of the ignition needle 6 is the housing of thefurnace chamber 4.

Example 3 (FIGS. 1, 3 and 4)

It is substantially the same as Example 1, differing only in that theignition negative pole of the ignition needle 6 is the housing of thefurnace chamber 4, the ignition needle 6 is used both as a flameionization probe of an accidental flameout protection device and as anignition needle for ignition flame; the circuit of the pulse controlleris designed such that the ignition needle 6 emits ignition sparks at thebeginning of the ignition, and after the burner is ignited, the ignitionneedle 6 immediately becomes a probe for detecting the combustion flamesignal of the burner.

Example 4 (FIGS. 5, 8 and 4)

It is substantially the same as Example 1, differing only in that theburner is a double ring burner, and the ignition nozzle 7 is placed inthe inner ring.

Example 5 (FIGS. 6, 9, 4 and 7)

It is substantially the same as Example 1, differing only in that theburner is a double ring burner, and the ignition nozzle 7 is placed inthe outer ring.

Example 6 (FIGS. 1, 2 and 4)

It is substantially the same as Example 1, differing only in that theporous combustion radiant panel 5 is a metal mesh combustion radiantpanel.

Example 7 (FIGS. 10 and 4)

It is substantially the same as Example 1, differing only in that thestructure of the porous combustion radiant panel 5 has two sets ofignition structures, each consisting of an ignition needle 6, anignition nozzle 7 and a sundries baffle 8.

Example 8 (FIGS. 11, 12, 13, 14 and 4)

It is substantially the same as Example 1, differing only in that thestructure of the porous combustion radiant panel 5 has a combined-shape,rectangular shape, square shape or trapezoid shape.

1. An infrared ray gas burner comprising: an ignition valve, a nozzle,an ejector, a furnace chamber, a porous combustion radiant panel, and anignition needle; wherein an ignition nozzle passes through the furnacechamber and is settled in a body of the furnace chamber and below theporous combustion radiant panel, a sundries baffle is provided in thefurnace chamber below the porous combustion radiant panel and above theignition nozzle, the ignition needle is set above the porous combustionradiant panel that is set above the ignition nozzle, a needle apex ofthe ignition needle is placed 1 mm to 10 mm above the porous combustionradiant panel.
 2. The burner of claim 1, wherein the ignition needle anda housing of the furnace chamber form an ignition circuit.
 3. The burnerof claim 1, wherein the burner is a double ring burner comprising aninner ring and an outer ring.
 4. The burner of claim 1, wherein in thatthe porous combustion radiant panel is selected from the groupconsisting of a porous ceramic radiant panel, a metal mesh combustionradiant panel, a metal fiber combustion radiant panel, a metal honeycombbodies combustion radiant panel, a foam metal combustion radiant panel,and a wire mesh combustion radiant panel or a metal hole combustionradiant panel.
 5. The burner of claim 1, further comprising anaccidental flameout protection device, and wherein the ignition needlecomprises flame ionization probe of the accidental flameout protectiondevice.
 6. The burner of claim 1, wherein the porous combustion radiantpanel has a shape selected from the group consisting of a circle, arectangle, a square, a trapezoid or a combination thereof.
 7. The burnerof claim 2, wherein the housing of the furnace chamber is an ignitionnegative pole.
 8. The burner of claim 2 wherein the ignition circuitfurther comprises, an independent ignition negative pole.
 9. The burnerof claim 3, wherein the ignition needle and the sundries baffle areplaced in one of the inner ring or the outer ring of the double ringburner.
 10. An infrared ray as burner comprising: an ignition valve; anozzle extending from the ignition valve; an ejector extending from thenozzle; a furnance chamber connected with the ejector and comprising aporous combustion radiant panel disposed onto an upper surface of thefurnance chamber, wherein an ignition needle is disposed adjacent theporous combustion radiant panel; an ignition nozzle connected with theignition valve and disposed within the furnance chamber below the porouscombustion radiant panel; and a sundries baffle disposed within thefurnace below the porous combustion radiant panel.
 11. The burner ofclaim 10, wherein the sundries baffle is positioned and above theignition nozzle.
 12. The burner of claim 10, wherein the ignition needleis positioned above the ignition nozzle.
 13. The burner of claim 10,wherein the ignition needle comprises an apex, and wherein the apex isposition 1 mm to 10 mm above the porous combustion radiant panel.